Haydraulic & Deck Machinary (Set 2)

1. In which of the listed hydraulic system components could an O-ring seal be satisfactorily used in providing a seal?

High pressure pump shaft casing

Low pressure pump shaft casing

Linear actuator without nylon insert

Relief valve spool

2. Before performing any maintenance on a hydraulic system storing energy in an accumulator, you should ___________.

pressurize the system to test for leaks

bleed off all pressure within the system

operate the machine until it reaches normal temperature

disconnect the pump pressure control switch

3. When installing a hydraulic hose, which of the following precautions should be taken?

The hose should not be twisted.

The hose should be protected with a sleeve if it is subjected to rubbing.

There should be some slack in the hose.

All of the above.

4. To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done?

Double the casing thickness.

Install an enlarged control ring around the rotor.

Provide small springs between the vanes and the base of the vane slots.

Provide one additional slot and vane.

5. A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oil. Another function is to ___________.

act as a shock absorber

maintain the stored oil under pressure

act as a base or foundation for the power unit

eliminate pressure surges in the system

6. The amount of the cushioning effect developed within a hydraulic cylinder is determined by the ___________.

position of the directional port in the cushion cavity

adjustment of the cushion cavity check valve

design shape of the cylinder ends

setting of the cushioning adjustment needle valve

7. Strainers are commonly used in hydraulic systems to ___________.

protect the pump from fine soluble contaminants

prevent solid particles from entering the pump

prevent solid particles from entering the filter

protect the directional control valves

8. A hydraulic system directional control valve fitted with "detent" will ___________.

have an infinite number of valve positions

usually be shifted into three specific positions

be able to be varied through out the travel of the valve spool

have an offset, directional control only

9. An O-ring seal in a hydraulic system will begin to leak when it has lost its interference fit due to ___________.

compression set or wear

low fluid pressure

high fluid flow

low fluid temperature

10. Purging air from a hydraulic system is necessary when ___________.

adding small amounts of oil to the system

the system has been overheated

the system has been drained and then filled with new oil

the system has been idle for a long period of time

Haydraulic & Deck Machinary (Set 2)

Multiple Choice Questions